220 41354 article Path: news.gmane.org!.POSTED!not-for-mail From: Dilip Ranganathan Newsgroups: gmane.comp.lang.c++.isocpp.proposals Subject: Re: Optimizing Power Function for Integral Types Date: Thu, 17 Jan 2019 11:06:11 -0500 Lines: 405 Approved: news@gmane.org Message-ID: References: Reply-To: std-proposals@isocpp.org NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: multipart/related; boundary="0000000000005b32d3057fa99317" X-Trace: blaine.gmane.org 1547741058 20476 195.159.176.226 (17 Jan 2019 16:04:18 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Thu, 17 Jan 2019 16:04:18 +0000 (UTC) To: std-proposals@isocpp.org Original-X-From: std-proposals+bncBDA3LYNSSUHBB76PQLRAKGQEW75627A@isocpp.org Thu Jan 17 17:04:14 2019 Return-path: Envelope-to: gclcip-std-proposals@m.gmane.org Original-Received: from mail-oi1-f198.google.com ([209.85.167.198]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1gkA9N-0005AS-RI for gclcip-std-proposals@m.gmane.org; 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[209.85.220.41]) by mx.google.com with SMTPS id r197sor1104079oie.80.2019.01.17.08.06.22 for (Google Transport Security); Thu, 17 Jan 2019 08:06:22 -0800 (PST) Received-SPF: pass (google.com: domain of misc.usage@gmail.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; X-Received: by 2002:aca:4b48:: with SMTP id y69mr8347265oia.200.1547741181945; Thu, 17 Jan 2019 08:06:21 -0800 (PST) In-Reply-To: X-Original-Sender: misc.usage@gmail.com X-Original-Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=hT3icDtF; spf=pass (google.com: domain of misc.usage@gmail.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=misc.usage@gmail.com; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Precedence: list Mailing-list: list std-proposals@isocpp.org; contact std-proposals+owners@isocpp.org List-ID: X-Spam-Checked-In-Group: std-proposals@isocpp.org X-Google-Group-Id: 399137483710 List-Post: , List-Help: , List-Archive: List-Subscribe: , List-Unsubscribe: , Xref: news.gmane.org gmane.comp.lang.c++.isocpp.proposals:41354 Archived-At: --0000000000005b32d3057fa99317 Content-Type: multipart/alternative; boundary="0000000000005b32d0057fa99316" --0000000000005b32d0057fa99316 Content-Type: text/plain; charset="UTF-8" I am just writing to +1 this. I have long wondered why there is no int overload for the pow function but wasn't confident enough of asking here fearing that I would've missed something blindingly obvious. Thanks Joel for taking that baton. On Thu, Jan 17, 2019 at 11:02 AM wrote: > As of C++11, per overload 7 of the 'pow' function ( > https://en.cppreference.com/w/cpp/numeric/math/pow), integral types can > be used as parameters, but they will be cast to double before calculation. > I believe that an integral-specific overload should be made, which makes > use of faster integer-operations available to CPUs. > > As a disclaimer, I am still a rather inexperienced programmer (College > Sophomore), and I my have some misunderstands as to what would fall under > the ISO standard and what would fall under compiler-implementations. As I > understand it, the line about "If any argument has integral type, it is > cast to double." is a component of the ISO standard. > > As stated on isocpp.org's FAQ section, this idea is based on existing > practices. As discussed here ( > https://stackoverflow.com/questions/2398442/why-isnt-int-powint-base-int-exponent-in-the-standard-c-libraries), > multiple implementations of this function have been made on a per-user > basis, due to its general simplicity and lack of inclusion in previous > standards. In the below testing, I created a function using x86 asm. It is > worth noting that even with more standard C++ approaches, as testified in > the stackoverflow discussion above, a significant performance improvement > can be made. > > For the sake of brevity, the data-table and source have been withheld, but > if it is relevant to the conversation, I would be more than willing to > provide them. > > Do any of you agree that this is a useful addition to the C++ standards? > > *Performance Testing:* > Tests were run on an Intel Core i3 6006U @ 2.0GHz > > Custom Function (VS 2017) : > __declspec(naked) __int32 __fastcall powi(__int32 base, __int32 exp) { > __asm { ... } } > > Test Range: > > base: [-46340, 46340] (int-truncation of the sqrt of MAX_INT) > > exp: [-19, 19] (highest power of 3, that does not overflow the int type) > > > Results: (Approx. x20 avg. improvement) > > [image: Untitled.png] > > > *Possible Use-Cases:* > > Allocation of N-dimensional arrays, with N^M elements. > > -- > You received this message because you are subscribed to the Google Groups > "ISO C++ Standard - Future Proposals" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to std-proposals+unsubscribe@isocpp.org. > To post to this group, send email to std-proposals@isocpp.org. > To view this discussion on the web visit > https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/fbfec82c-5416-4c96-b53b-ef3d4309b613%40isocpp.org > > . > -- You received this message because you are subscribed to the Google Groups "ISO C++ Standard - Future Proposals" group. To unsubscribe from this group and stop receiving emails from it, send an email to std-proposals+unsubscribe@isocpp.org. To post to this group, send email to std-proposals@isocpp.org. To view this discussion on the web visit https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CALEPxfvZRppNMssi7byXc0oNuuw_Q88YhW7huMN0q4SJnXK-mw%40mail.gmail.com. --0000000000005b32d0057fa99316 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable
I am just writing to=C2=A0+1 this. I have long wondered wh= y there is no int overload
for the pow function but wasn't confident= enough of asking here fearing that
I would've missed something blin= dingly obvious.

Thanks Joel for taking that baton.
=

On Thu, Jan 17, 2019 = at 11:02 AM <joel.g.hemphil= l@gmail.com> wrote:
As of C++11, per overload 7 of the 'pow'= ; function (https://en.cppreference.com/w/cpp/numeric/math/pow), = integral types can be used as parameters, but they will be cast to double b= efore calculation. I believe that an integral-specific overload should be m= ade, which makes use of faster integer-operations available to CPUs.
As a disclaimer, I am still a rather inexperienced programmer = (College Sophomore), and I my have some misunderstands as to what would fal= l under the ISO standard and what would fall under compiler-implementations= .. As I understand it, the line about "If any argument has integral type,=C2=A0it is cast to double." is a component of the ISO sta= ndard.

<= /div>
= As stated on isocpp.org= 's FAQ section, this idea is based on existing practices. As discussed = here (https://stackoverflow.com/questions/2398442/= why-isnt-int-powint-base-int-exponent-in-the-standard-c-libraries), multiple implementations=C2=A0of this functio= n have been made on a per-user basis, due to its general simplicity and lac= k of inclusion in previous standards. In the below testing, I created a fun= ction using x86 asm. It is worth noting that even with more standard C++ ap= proaches, as testified in the stackoverflow discussion above, a significant= performance improvement can be made.

For the sake o= f brevity, the data-table and source have been withheld, but if it is relev= ant=C2=A0to the conversation, I would be more than willing to provide them.=

Do any of you agree that this is a useful addition = to the C++ standards?

Perf= ormance Testing:
Tests were run on an I= ntel Core i3 6006U @ 2.0GHz

Custom Function= (VS 2017) :
__declspec(naked) __int32 __fastcall powi(__int32 base= , __int32 exp) { _= _asm { ... }= }

<= div>Test Range:
base: [-46340, 46340]=C2=A0 (int-truncation of the sqr= t of MAX_INT)
exp: [-19, 19] (highest power of 3, that does no= t overflow the int type)

Results: (Approx. = x20 avg. improvement)

3D"Untitled.png"


Possible Use-Cases:

Allocation of N-dimensional a= rrays, with N^M elements.

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
To unsubscribe from this group and stop receiving emails from it, send an e= mail to std-proposals+unsubscribe@isocpp.org.
To post to this group, send email to std-proposals@isocpp.org.
To view this discussion on the web visit = https://groups.google.com/a/isocpp.org/d/msgid/std-proposals/fbfec82c-5416-= 4c96-b53b-ef3d4309b613%40isocpp.org.

--
You received this message because you are subscribed to the Google Groups &= quot;ISO C++ Standard - Future Proposals" group.
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To view this discussion on the web visit htt= ps://groups.google.com/a/isocpp.org/d/msgid/std-proposals/CALEPxfvZRppNMssi= 7byXc0oNuuw_Q88YhW7huMN0q4SJnXK-mw%40mail.gmail.com.
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